import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.util.List;

@WebServlet(name = "PrServlet", urlPatterns = "/Upload")
public class PrServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    request.setCharacterEncoding("utf8");
    response.setContentType("text/html;charset=utf8");
    if (!ServletFileUpload.isMultipartContent(request)){
        return;
    }
        FileItemFactory factory=new DiskFileItemFactory();
        ServletFileUpload upload=new ServletFileUpload(factory);
    upload.setFileSizeMax(1024);
    upload.setSizeMax(1024);
    upload.setHeaderEncoding("utf8");
    String path=getServletContext().getRealPath("")+File.separator+"upload";
    File uploadDir=new File(path);
    if (!uploadDir.exists()){
        uploadDir.mkdir();
    }
        try {
            List<FileItem> fileItems = upload.parseRequest(request);
            if (fileItems.size()>0&&fileItems!=null){
                for (FileItem fileItem : fileItems) {
                    if (fileItem.isFormField()){
                        continue;
                    }
                    String filename=fileItem.getName();
                    String filepath=path+File.separator+filename;
                    File file=new File(filepath);
                    fileItem.write(file);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}
